A test device suitable for measuring thermal physical parameters of a shell

Abstract

The present application belongs to the technical field of precision casting shell detection, and particularly relates to a test device suitable for determining the thermal physical property parameters of a shell, comprising a switching unit and a temperature measuring unit, the switching unit comprising a base and a turntable, the turntable being rotationally connected to the base, the top of the turntable being provided with four limiting grooves, and the limiting grooves being provided with a positioning mechanism; the temperature measuring unit comprising an infrared detector array, an infrared thermal imager and a temperature measuring data adapter module, the infrared detector array being used for collecting the temperature of the shell surface, the infrared thermal imager being used for capturing the dynamic temperature distribution of the shell surface, and the temperature measuring data adapter module being used for receiving the temperature measuring data of the infrared detector array and the infrared thermal imager and realizing the synchronous collection and unified transmission of the two sets of temperature measuring data. Through the positioning mechanism, the shell in the limiting groove can be positioned and clamped, and the accuracy of the temperature measuring result is ensured; through the switching unit, multiple independent repeated tests are adopted, the influence of accidental factors is eliminated, and the accuracy of the detection result is improved.

Description

Technical Field

[0001] This invention belongs to the field of precision casting mold shell testing technology, specifically relating to a test device suitable for measuring the thermophysical parameters of mold shells. Background Technology

[0002] In the global wave of manufacturing transformation towards precision, digitalization, and green practices, the optimization and innovation of casting processes have become a crucial link in improving product performance, reducing production costs, and shortening R&D cycles. Anti-gravity low-pressure casting technology, due to its advantages such as stable mold filling and controllable defects, has been widely used in high-end equipment manufacturing fields such as aerospace, automotive, and defense. However, the heat exchange behavior between the mold shell and the molten metal during the casting process is extremely complex. The thermophysical properties of the mold shell (such as heat transfer coefficient, thermal conductivity, and specific heat capacity) directly determine the solidification path, microstructure evolution, and final mechanical properties of the casting.

[0003] Currently, the testing devices used for measuring the thermophysical parameters of mold shells have the following drawbacks: First, the mold shell clamping and positioning accuracy is poor: In the past, the mold shell was mostly placed directly under the measuring instrument for testing, resulting in a large clamping and positioning error, which caused the temperature measuring point to shift and affected the accuracy of the measurement results; Second, the single test has a large degree of randomness: For sand molds (slow cooling process) and metal molds (quench cooling process), the test is generally only conducted once. The results of a single test may be affected by random factors such as environmental fluctuations and operational errors, resulting in inaccurate results. Summary of the Invention

[0004] To address the aforementioned deficiencies in the existing technology, this invention provides a test device suitable for measuring the thermophysical parameters of mold shells, comprising a switching unit and a temperature measuring unit. The switching unit includes a base and a turntable. The turntable is rotatably connected above the base via a rotating shaft. The center of the turntable and the center of the base are located on the same vertical axis, and a certain gap is left between the turntable and the base. Four limiting grooves are evenly arranged on the top surface of the turntable for placing the mold shell. Each limiting groove is provided with a positioning mechanism for positioning and clamping the mold shell in the limiting groove.

[0005] The temperature measurement unit is located on one side of the switching unit. The temperature measurement unit includes an infrared detector array, an infrared thermal imager, and a temperature measurement data conversion module. The infrared detector array is located on the side of the switching unit and is used to collect the temperature of the shell surface. The infrared thermal imager is located on the top of the switching unit and is used to capture the dynamic temperature distribution of the shell surface. The temperature measurement data conversion module is electrically connected to the infrared detector array and the infrared thermal imager respectively. It is used to receive the temperature measurement data from the infrared detector array and the infrared thermal imager and realize the synchronous acquisition and unified transmission of the two sets of temperature measurement data. The sampling frequency can be adjusted within the range of 1~10Hz.

[0006] Preferably, an electromagnet is provided on the side of the base near the temperature measuring unit, and a device cavity is provided in the center of the base. A servo motor is provided in the device cavity, and the output shaft of the servo motor is connected to the rotating shaft for transmission.

[0007] Preferably, each limiting groove has two guide slots at both ends, and each limiting groove has a receiving cavity at the bottom, which is located inside the turntable.

[0008] Preferably, each positioning mechanism includes a housing, an armature, and two horizontal traction rods. The housing is disposed in the receiving cavity, and the position of the housing corresponds to that of the limiting groove. Two horizontal guide slots are provided on both sides of the housing, and two guide pulleys are provided inside the housing. A vertical guide slot is provided at the bottom of the housing. The armature passes through the vertical guide slot of the housing, and the bottom of the armature protrudes from the bottom of the turntable. The two horizontal traction rods are respectively passed through the two horizontal guide slots of the housing. One end of the horizontal traction rod is fixedly connected to a traction rope, and the other end of the traction rope passes around the guide pulley and is fixedly connected to the top of the armature. The other end of the horizontal traction rod protrudes from the horizontal guide slot and is fixedly connected to a support rod. A compression spring is provided on the outside of the other end of the horizontal traction rod, and the two ends of the compression spring are respectively connected to the support rod and the outer wall of the housing. The top of the support rod protrudes from the guide slot and is fixedly connected to a clamping plate.

[0009] Preferably, the distance from the center of the armature to the center of the turntable is equal to the distance from the center of the electromagnet to the center of the base.

[0010] Specifically, whenever the turntable rotates a certain angle, it ensures that the electromagnet and armature can be smoothly attracted.

[0011] Preferably, an elastic gasket is provided on the inner side of the clamping plate.

[0012] Specifically, the elastic gasket can prevent the shell from breaking due to hard contact between the clamping plate and the shell.

[0013] Preferably, a ring track is provided on the top surface of the base, and a support wheel is provided on the bottom of the turntable, with the support wheel slidably connected to the ring track to improve the stability of the turntable during rotation.

[0014] Preferably, the temperature measuring unit is also provided with a mounting bracket, the infrared detector array includes multiple infrared detectors, and the multiple infrared detectors, infrared thermal imager and temperature measurement data conversion module are all fixedly mounted on the mounting bracket.

[0015] Preferably, the infrared thermal imager and the electromagnet on the base are vertically aligned.

[0016] This invention also includes other components that enable the testing apparatus suitable for measuring the thermophysical properties of shells to function properly, all of which are conventional techniques in the art. Furthermore, any devices or components not specified in this invention employ conventional techniques in the art.

[0017] The working principle of this invention is as follows: During use, a mold shell filled with molten metal is placed in the limiting groove of a turntable. A servo motor is started, driving the turntable to rotate, which in turn causes the mold shell to rotate around the rotating axis. When the mold shell rotates directly above the electromagnet, the electromagnet's coil is energized, generating a magnetic field that attracts the armature above it downwards. As the armature descends, it drives two horizontal traction rods to move towards each other via two traction ropes, thereby causing the two clamping plates to move closer together. Once the electromagnet and armature are fully attracted, the mold shell is clamped and positioned. Afterwards, the temperature measuring unit starts working, an infrared detector array measures the temperature of the mold shell at multiple points, and an infrared thermal imager captures the temperature of the mold shell in real time. The dynamic temperature distribution on the shell surface is measured by a temperature data transfer module that receives temperature data from an infrared detector array and an infrared thermal imager, and achieves synchronous acquisition and unified transmission of the two sets of temperature data. The temperature-time curve is plotted and imported into the ProCAST simulation model to simulate the errors of key indicators such as solidification time and cooling curves compared with the actual experiment. Subsequently, the electromagnet is de-energized, the magnetic field disappears, and the two horizontal traction rods move in opposite directions under the rebound of the compression spring. Then, the armature is moved upward through the traction rope. After the servo motor drives the turntable to rotate 90°, the temperature measurement of the next shell begins. This operation continues until all the shells in the limit slots on the turntable have been measured.

[0018] The beneficial effects of this invention are:

[0019] (1) The present invention can position and clamp the shell in the limiting groove through the positioning mechanism. Compared with manual placement, the positioning of this device is more accurate, ensuring the accuracy of the temperature measurement results.

[0020] (2) By switching units, the present invention adopts multiple independent repeated tests to eliminate the influence of accidental factors and improve the accuracy of the test results. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0023] Figure 2 This is a schematic diagram of the switching unit of the present invention.

[0024] Figure 3 This is a partial structural diagram of the positioning mechanism in an embodiment of the present invention when the electromagnet is energized.

[0025] Figure 4 This is a partial structural diagram of the positioning mechanism in an embodiment of the present invention when the electromagnet is de-energized.

[0026] In the diagram: 1. Base, 2. Turntable, 3. Electromagnet, 4. Servo motor, 5. Rotating shaft, 6. Limiting groove, 7. Shell, 8. Guide slot, 9. Receiving cavity, 10. Positioning mechanism, 11. Box body, 12. Armature, 13. Horizontal traction rod, 14. Guide pulley, 15. Traction rope, 16. Support rod, 17. Compression spring, 18. Clamping plate, 19. Support wheel, 20. Mounting bracket, 21. Infrared detector array, 22. Infrared thermal imager, 23. Temperature measurement data conversion module. Detailed Implementation

[0027] The present invention will now be clearly described with reference to the accompanying drawings and specific embodiments. This description is merely illustrative and is not intended to limit the scope of the invention. Any modifications, equivalent substitutions, or improvements made by those skilled in the art based on the embodiments of the present invention without inventive effort to obtain all other embodiments should be included within the scope of protection of the present invention.

[0028] Example like Figure 1-4 As shown, this embodiment of the invention provides a test device suitable for measuring the thermophysical parameters of a shell, including a switching unit and a temperature measuring unit. The switching unit includes a base 1 and a turntable 2. An electromagnet 3 is provided on the side of the base 1 near the temperature measuring unit. An equipment cavity is provided in the center of the base 1, and a servo motor 4 is provided in the equipment cavity. The turntable 2 is rotatably connected to the top of the base 1 via a rotating shaft 5, and the rotating shaft 5 is connected to the output shaft of the servo motor 4. The center of the turntable 2 and the center of the base 1 are located on the same vertical axis, and a certain gap is left between the turntable 2 and the base 1. Four limiting grooves 6 are evenly provided on the top surface of the turntable 2 for placing the shell 7. Two guide slots 8 are provided at both ends of each limiting groove 6. A receiving cavity 9 is provided at the bottom of each limiting groove 6, and the receiving cavity 9 is located inside the turntable 2. A positioning mechanism 10 is provided at each limiting groove 6 for positioning and clamping the shell 7 in the limiting groove 6.

[0029] Each positioning mechanism 10 includes a housing 11, an armature 12, and two horizontal traction rods 13. The housing 11 is disposed in the receiving cavity 9, and the housing 11 corresponds to the position of the limiting groove 6. Two horizontal guide slots are provided on both sides of the housing 11. Two guide pulleys 14 are provided inside the housing 11. A vertical guide slot is provided at the bottom of the housing 11. The armature 12 passes through the vertical guide slot of the housing 11, and the bottom of the armature 12 protrudes from the bottom of the turntable 2. The two horizontal traction rods 13 are respectively passed through the two horizontal guide slots of the housing 11, and one end of the horizontal traction rod 13 is fixed. A traction rope 15 is connected, and the other end of the traction rope 15 passes around the guide pulley 14 and is fixedly connected to the top of the armature 12. The other end of the horizontal traction rod 13 passes through the horizontal guide slot and is fixed with a support rod 16. A compression spring 17 is provided on the outside of the other end of the horizontal traction rod 13, and the two ends of the compression spring 17 are respectively connected to the support rod 16 and the outer wall of the box 11. The top end of the support rod 16 passes through the guide slot 8 and is fixed with a clamping plate 18. An elastic gasket is provided on the inner side of the clamping plate 18. Specifically, the elastic gasket can prevent the clamping plate 18 from making hard contact with the shell 7, which would cause damage to the shell 7.

[0030] Additionally, it should be noted that the distance from the center of armature 12 to the center of turntable 2 is equal to the distance from the center of electromagnet 3 to the center of base 1. Specifically, this ensures that electromagnet 3 and armature 12 can smoothly engage whenever turntable 2 rotates a certain angle. A circular track is provided on the top surface of base 1, and a support wheel 19 is provided on the bottom of turntable 2. The support wheel 19 is slidably connected to the circular track to improve the stability of turntable 2 during rotation.

[0031] The temperature measurement unit is located on one side of the switching unit. The temperature measurement unit includes a mounting bracket 20, an infrared detector array 21, an infrared thermal imager 22, and a temperature measurement data conversion module 23 mounted on the mounting bracket 20. The infrared detector array 21 is located on the side of the switching unit and includes multiple infrared detectors for collecting the temperature of the surface of the shell 7. The infrared thermal imager 22 is located on the top of the switching unit and is positioned vertically opposite to the electromagnet 3 on the base 1 for capturing the dynamic temperature distribution of the surface of the shell 7. The temperature measurement data conversion module 23 is electrically connected to the infrared detector array 21 and the infrared thermal imager 22 respectively, for receiving the temperature measurement data from the infrared detector array 21 and the infrared thermal imager 22, and realizing the synchronous acquisition and unified transmission of the two sets of temperature measurement data. The sampling frequency can be adjusted within the range of 1~10Hz.

[0032] The working principle of this invention is as follows: During use, the mold shell 7 filled with molten metal is placed in the limiting groove 6 of the turntable 2. The servo motor 4 is started, driving the turntable 2 to rotate, which in turn causes the mold shell 7 to rotate around the rotating shaft 5. When the mold shell 7 rotates directly above the electromagnet 3, the electromagnetic coil of the electromagnet 3 is energized, and the electromagnet 3 generates a magnetic field that attracts the armature 12 above downwards. During the descent of the armature 12, the two horizontal traction rods 13 move towards each other via two traction ropes 15, thereby driving the two clamping plates 18 to move closer together. After the electromagnet 3 and the armature 12 are fully attracted, the mold shell 7 is clamped and positioned. Then, the temperature measuring unit starts working, the infrared detector array 21 measures the temperature of the mold shell 7 at multiple points, and the infrared thermal imager 22... The dynamic temperature distribution on the surface of the shell 7 is captured in real time. The temperature measurement data transfer module 23 receives the temperature measurement data from the infrared detector array 21 and the infrared thermal imager 22, and realizes the synchronous acquisition and unified transmission of the two sets of temperature measurement data. The temperature-time curve is plotted and imported into the ProCAST simulation model to simulate the error of key indicators such as solidification time and cooling curve compared with the actual test. Subsequently, the electromagnet 3 is de-energized, the magnetic field disappears, and the two horizontal traction rods 13 move in opposite directions under the rebound action of the compression spring 17. Then, the armature 12 is moved upward through the traction rope 15. After the servo motor 4 drives the turntable to rotate 90°, the temperature measurement of the next shell 7 begins. This operation continues until all the shells 7 in the limit slots 6 on the turntable 2 have been measured.

[0033] The embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A test apparatus suitable for determining the thermophysical parameters of a shell, comprising a switching unit and a temperature measuring unit, characterized in that: The switching unit includes a base and a turntable. The turntable is rotatably connected to the top of the base via a rotating shaft. Four limiting grooves are evenly arranged on the top surface of the turntable for placing the mold shell. Each limiting groove is provided with a positioning mechanism for positioning and clamping the mold shell in the limiting groove. The temperature measurement unit is located on one side of the switching unit. The temperature measurement unit includes an infrared detector array, an infrared thermal imager, and a temperature measurement data conversion module. The infrared detector array is located on the side of the switching unit and is used to collect the temperature of the shell surface. The infrared thermal imager is located on the top of the switching unit and is used to capture the dynamic temperature distribution of the shell surface. The temperature measurement data conversion module is electrically connected to the infrared detector array and the infrared thermal imager respectively, and is used to receive the temperature measurement data from the infrared detector array and the infrared thermal imager, and realize the synchronous acquisition and unified transmission of the two sets of temperature measurement data.

2. The test apparatus for determining the thermophysical parameters of a shell according to claim 1, characterized in that: An electromagnet is installed on the side of the base near the temperature measuring unit. A device cavity is located in the center of the base, and a servo motor is installed in the device cavity. The output shaft of the servo motor is connected to the rotating shaft for transmission.

3. The test apparatus for determining the thermophysical parameters of a shell according to claim 2, characterized in that: Each limiting groove has two guide slots at both ends, and each limiting groove has a receiving cavity at the bottom, which is located inside the turntable.

4. The test apparatus for determining the thermophysical parameters of a shell according to claim 3, characterized in that: Each positioning mechanism includes a housing, an armature, and two horizontal traction rods. The housing is housed within the receiving cavity, and its position corresponds to the limiting groove. Two horizontal guide slots are provided on both sides of the housing, and two guide pulleys are provided inside the housing. A vertical guide slot is provided at the bottom of the housing. The armature passes through the vertical guide slot of the housing, and its bottom protrudes from the bottom of the turntable. The two horizontal traction rods pass through the two horizontal guide slots of the housing, respectively. One end of each horizontal traction rod is fixedly connected to a traction rope, and the other end of the traction rope passes around the guide pulley and is fixedly connected to the top of the armature. The other end of each horizontal traction rod protrudes from the horizontal guide slot and is fixedly connected to a support rod. A compression spring is provided on the outside of the other end of each horizontal traction rod, and the two ends of the compression spring are respectively connected to the support rod and the outer wall of the housing. A clamp is fixed to the top of the support rod.

5. The test apparatus for determining the thermophysical parameters of a shell according to claim 4, characterized in that: The distance from the center of the armature to the center of the turntable is equal to the distance from the center of the electromagnet to the center of the base.

6. The test apparatus for determining the thermophysical parameters of a shell according to claim 5, characterized in that: The inner side of the clamp is equipped with elastic pads.

7. The test apparatus for determining the thermophysical parameters of a shell according to claim 1, characterized in that: A circular track is provided on the top surface of the base, and a support wheel is provided on the bottom of the turntable, with the support wheel slidably connected to the circular track.

8. The test apparatus for determining the thermophysical parameters of a shell according to claim 1, characterized in that: The temperature measurement unit is also equipped with a mounting bracket. The infrared detector array includes multiple infrared detectors, and the multiple infrared detectors, infrared thermal imager, and temperature measurement data conversion module are all fixedly mounted on the mounting bracket.

9. The test apparatus for determining the thermophysical parameters of a shell according to claim 8, characterized in that: The infrared thermal imager and the electromagnet on the base are aligned vertically.

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